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SVT Shelby GT500
07-14 Shelby GT500 EGR Delete "How To"
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<blockquote data-quote="Bad Company" data-source="post: 15515647" data-attributes="member: 141815"><p>I haven't read the link. I was hoping somebody else would answer the question, but they haven't. I've been reluctant to answer the question for a number of personal reasons regarding my history and forums in general </p><p></p><p>The jest of the issue with deleting the EGR has to deal with part throttle cruise conditions. In this driving situation cylinder temperatures are capable of rising higher than during WOT conditions where Air/Fuel Ratios are much richer. During cruise A/F Ratios are normally around 14.8:1, whereas at WOT they'll be roughly 10.8:1 or slightly lower depending on the tuner. </p><p></p><p>The richer fuel conditions at WOT act as a coolant in of itself to reduce the possibilities of detonation occurring during the combustion process. </p><p></p><p>Now the next question is how does EGR reduce cylinder temperatures during the combustion process at part throttle cruise conditions with leaner A/F Ratios?</p><p></p><p>Spent exhaust gases are inert gases..........they can't burn. Yes they are hot gases, but they don't contribute anything to the combustion process of burning the A/F mixture in the cylinder during these lean engine cruise conditions. So they reduce the cylinder temperatures of the combustion process, which in of itself reduces the possibilities of detonation under these driving conditions. Now the OEM also found that reduced cylinder temperature also reduces the engine's output of Nitrogen Oxide emissions during the most often way a car is driven, part throttle cruise conditions. It allows the engine manufactures to tune for peak performance/fuel economy without the fear of detonation while reducing emissions.</p><p></p><p>If you want a better understanding of the physics occurring inside the engine and are willing to sit down to read and comprehend the information in basic layman terms, here is a great link to understanding what is occurring and why EGR can be beneficial. </p><p></p><p><a href="http://www.contactmagazine.com/Issue54/EngineBasics.html" target="_blank">http://www.contactmagazine.com/Issue54/EngineBasics.html</a></p><p></p><p>You can also delete the EGR, but realize in doing so you immediately must fatten the part throttle cruise conditions A/F Ratio to decrease the cylinder temperatures to reduce the chances of detonation during these driving conditions. Expect fuel mileage to suffer by 10% and possibly more. By doing this you're again using the fatter A/F Ratio to help cool the cylinder temperatures.</p><p></p><p>Engines running on E85 most of the time I believe are ideal candidates for EGR Deletes, but must be tuned fat for gasoline. E85 reduces cylinder temperatures much better than gasoline during the combustion process.</p></blockquote><p></p>
[QUOTE="Bad Company, post: 15515647, member: 141815"] I haven't read the link. I was hoping somebody else would answer the question, but they haven't. I've been reluctant to answer the question for a number of personal reasons regarding my history and forums in general The jest of the issue with deleting the EGR has to deal with part throttle cruise conditions. In this driving situation cylinder temperatures are capable of rising higher than during WOT conditions where Air/Fuel Ratios are much richer. During cruise A/F Ratios are normally around 14.8:1, whereas at WOT they'll be roughly 10.8:1 or slightly lower depending on the tuner. The richer fuel conditions at WOT act as a coolant in of itself to reduce the possibilities of detonation occurring during the combustion process. Now the next question is how does EGR reduce cylinder temperatures during the combustion process at part throttle cruise conditions with leaner A/F Ratios? Spent exhaust gases are inert gases..........they can't burn. Yes they are hot gases, but they don't contribute anything to the combustion process of burning the A/F mixture in the cylinder during these lean engine cruise conditions. So they reduce the cylinder temperatures of the combustion process, which in of itself reduces the possibilities of detonation under these driving conditions. Now the OEM also found that reduced cylinder temperature also reduces the engine's output of Nitrogen Oxide emissions during the most often way a car is driven, part throttle cruise conditions. It allows the engine manufactures to tune for peak performance/fuel economy without the fear of detonation while reducing emissions. If you want a better understanding of the physics occurring inside the engine and are willing to sit down to read and comprehend the information in basic layman terms, here is a great link to understanding what is occurring and why EGR can be beneficial. [URL]http://www.contactmagazine.com/Issue54/EngineBasics.html[/URL] You can also delete the EGR, but realize in doing so you immediately must fatten the part throttle cruise conditions A/F Ratio to decrease the cylinder temperatures to reduce the chances of detonation during these driving conditions. Expect fuel mileage to suffer by 10% and possibly more. By doing this you're again using the fatter A/F Ratio to help cool the cylinder temperatures. Engines running on E85 most of the time I believe are ideal candidates for EGR Deletes, but must be tuned fat for gasoline. E85 reduces cylinder temperatures much better than gasoline during the combustion process. [/QUOTE]
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07-14 Shelby GT500 EGR Delete "How To"
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